栗绛蚧长尾啮小蜂生物学及利用

Study on biology and utility of Aprostocetus sp.on Kermes nawai

浙江省建德市寄生于板栗栗绛蚧Kermesnawai上的栗绛蚧长尾啮小蜂Aprostocetussp.进行了采集和观察。该蜂1年2代,成虫分别出现于4～5月和6～7月,第1代产卵在栗绛蚧成虫,第2代产卵于栗绛蚧2龄以上若虫的体内。采集建德市板栗Castaneamollissina林中被寄生栗绛蚧成虫于室内饲养,羽化出啮小蜂在衢州市板栗林中释放。结果表明3a内试验林栗绛蚧种群每10cm枝条从22 00头降低到1 83头,板栗产量从300kg·hm-2上升到2250kg·hm-2。

.Collection and observation on Aprostocetus sp.on Kermes nawai were executed in Jiande of Zhejiang 1998～2002.The parasitoid occurred twice a year,the adults emerged in April to May,September to October respectively.The adults of the first generation lay eggs into the body of adults,the adults of the second generation lay eggs into the body of nymphs in second instar.The adults of Kermes nawai were collected and kept in laboratory,the adults of Aprostocetus sp.emerged were released in chestnut forest Quzhou,Zhejiang for control of Kermes nawai.The result showed that the population density of Kermes nawai decreased from 22.00 adults per 10 cm branch in April 2000 to 1.83 adults per 10 cm branch in April 2002.The insect pests were kept under control.Chinese chestnut yield increased from 300 kg per hectare to 2 250 kg per hectare.